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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd562ccbb216be8c3f16c10ca24463f0149aa090cc9f496bf219e380a509a630' 
  AND token = '8px0vQZSuDigx2XNBTXTUQstx0F/hLlJuEGuK/WF1vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}